Season and Roast: Carefully pull the hot baking sheet from the oven and immediately toss your shredded mushrooms directly into the oil—they should sizzle right away! Evenly sprinkle your paprika, garlic powder, and onion powder across the top. Toss thoroughly until every strand is beautifully coated in the spiced oil, spread them into a flat, single layer, and bake for 15 minutes until wilted and golden-brown.